I had that problem too when I first started using Vent. Here's the config you need for it to go away.
In the area that sets up the PTT (push to talk), you should have the first 2 boxes checked, the 3rd unchecked, the 4th checked and the 5th unchecked. That should allow you to use PTT and also avoid the repeating beeps while talking.How it should look
Hope this helped!